JP3772546B2 - Inverter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inverter device.
[0002]
[Prior art]
Conventionally, an inverter device is provided in an electric vehicle, and in the inverter device, a three-phase phase current is generated by driving an inverter formed by a bridge circuit, and the phase current is supplied to a motor. It has become.
For this purpose, a control device is provided, which generates a pulse width modulation signal, outputs the pulse width modulation signal to the bridge circuit, and switches the transistors of the bridge circuit.
[0003]
By the way, a hybrid vehicle among electric vehicles is equipped with a motor and a generator, and a motor inverter and a generator inverter are disposed as the inverters, and are controlled independently. In order to mount the motor inverter and the generator inverter in the engine room of the hybrid vehicle, the motor inverter and the generator inverter are integrated and accommodated in a common inverter case.
[0004]
Further, a common smoothing electrolytic capacitor is used for the inverter for the motor and the inverter for the generator (see JP-A-9-233831).
[0005]
[Problems to be solved by the invention]
However, in the conventional inverter device, when a common electrolytic capacitor for smoothing is used for the inverter for the motor and the inverter for the generator, the inverter for the motor and the inverter for the generator may be damaged, thus reducing the reliability. Resulting in.
[0006]
That is, each of the bridge circuits constituting the motor inverter and the generator inverter is provided with six transistors for switching the transistors. When each transistor is turned on, the collector-emitter connection is established. Surge voltage is generated. For example, when the wiring distance between the smoothing electrolytic capacitor and the motor inverter is extremely different from the wiring distance between the smoothing electrolytic capacitor and the generator inverter, the bridge circuit constituting the motor inverter The surge voltage generated is extremely different from the surge voltage generated in the bridge circuit constituting the generator inverter, and the amount of heat generation increases or exceeds the withstand voltage of the transistor. As a result, the inverter for the motor and the inverter for the generator malfunction or are damaged, thereby reducing the reliability of the inverter device.
[0007]
Therefore, in order to suppress each surge voltage generated in the motor inverter and the generator inverter, it is conceivable to increase the capacity of the diodes, resistors, capacitors, etc. constituting the snubber circuit arranged in each bridge circuit. Increasing the capacity of the diode, resistor, capacitor, etc. not only complicates the bridge circuit, but also increases the cost of the inverter device.
[0008]
An object of the present invention is to solve the problems of the conventional inverter device, and to provide an inverter device that can improve the reliability and reduce the cost.
[0009]
[Means for Solving the Problems]
  For this purpose, in the inverter device of the present invention, the first to third main circuit wiring portions branching from each other at the branch point and the end portions of the first main circuit wiring portions are arranged, and the direct current from the battery And a DC voltage that is generated when a DC current is supplied to the DC input terminal connected between the DC input terminal and the branch point in the first main circuit wiring section. An electrolytic capacitor for smoothing, a motor inverter connected to the second main circuit wiring section, for converting the direct current into an alternating current and supplying the alternating current to the motor, and the third And a generator inverter for converting the alternating current from the generator into a direct current and supplying the direct current to the battery.
  And the maximum current flowing through the transistor of the motor inverter and the maximum current flowing through the transistor of the generator inverter are equal to each other, the wiring distance between the smoothing electrolytic capacitor and the motor inverter, and the smoothing electrolytic capacitor And the wiring distance between the generator inverters.
[0010]
  In another inverter device of the present invention, the first to third main circuit wiring portions branching from each other at a branching point and the end of the first main circuit wiring portion are arranged, and direct current from the battery is supplied. A direct current input terminal for supplying and a direct current voltage generated by supplying a direct current to the direct current input terminal connected between the direct current input terminal and the branch point in the first main circuit wiring section. A smoothing electrolytic capacitor for smoothing; a motor inverter connected to the second main circuit wiring portion; for converting the direct current into alternating current; and supplying the alternating current to the motor; and the third A generator inverter is connected to the main circuit wiring unit, converts an alternating current from the generator into a direct current, and supplies the direct current to the battery.
  And a wiring distance between the smoothing electrolytic capacitor and the motor inverter, and the smoothing electrolysis by an amount different from a maximum current flowing through the transistor of the motor inverter and a maximum current flowing through the transistor of the generator inverter. The wiring distance between the capacitor and the generator inverter is set differently.
  In still another inverter device of the present invention, when the maximum current flowing through the transistor of the motor inverter is larger than the maximum current flowing through the transistor of the generator inverter, the current between the smoothing electrolytic capacitor and the motor inverter When the wiring distance is shorter than the wiring distance between the smoothing electrolytic capacitor and the generator inverter, and the maximum current flowing through the transistor of the motor inverter is smaller than the maximum current flowing through the transistor of the generator inverter, the smoothing The wiring distance between the electrolytic capacitor and the motor inverter is made longer than the wiring distance between the smoothing electrolytic capacitor and the generator inverter.
[0011]
  In still another inverter device of the present invention, the first to third main circuit wiring portions branching from each other at a branching point and the end of the first main circuit wiring portion are arranged, and the direct current from the battery And a DC voltage that is generated when a DC current is supplied to the DC input terminal connected between the DC input terminal and the branch point in the first main circuit wiring section. An electrolytic capacitor for smoothing, a motor inverter connected to the second main circuit wiring section, for converting the direct current into an alternating current and supplying the alternating current to the motor, and the third And a generator inverter for converting the alternating current from the generator into a direct current and supplying the direct current to the battery.
  The first to third main circuit wiring portions have a laminated structure in which a positive electrode bus bar and a negative electrode bus bar are overlapped, and the maximum current flowing through the transistor of the motor inverter and the generator inverter The overlapping area in the second main circuit wiring portion and the overlapping area in the third main circuit wiring portion are set different from each other by an amount different from the maximum current flowing through the transistor.
  In still another inverter device of the present invention, when the maximum current flowing through the transistor of the motor inverter is larger than the maximum current flowing through the transistor of the generator inverter, the overlapping area in the second main circuit wiring portion is When the maximum current flowing through the transistor of the motor inverter is smaller than the maximum current flowing through the transistor of the generator inverter, the overlapping area of the second main circuit wiring portion is larger than the overlapping area of the third main circuit wiring portion. It is made smaller than the overlapping area in the third main circuit wiring portion.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram of an inverter device according to a first embodiment of the present invention.
In the figure, 11 is a heat sink plate as a metal base member that constitutes a heat sink and has good thermal conductivity. A flow path (not shown) is formed in the heat sink plate 11, and the heat flow is not shown. The vessel is connected via a connecting portion 61, and cooling water is caused to flow through the flow path. The cooling water whose temperature has risen due to the heat of the heat sink plate 11 is sent to the radiator and cooled by the radiator.
[0013]
Reference numeral 12 denotes an inverter case which is fixed on the heat sink plate 11 and forms an inverter accommodating chamber 14 together with the heat sink plate 11, and 13 is fixed under the heat sink plate 11, and is connected to the control board accommodating chamber 18 together with the heat sink plate 11. The inverter case 12 and the control board case 13 are formed of a conductive material.
[0014]
In the inverter accommodating chamber 14, an inverter for a motor as an inverter composed of a transistor module 15 (only one transistor module 15 is shown in the figure) as three switching elements, as three switching elements. A generator inverter as an inverter composed of a transistor module 16 (only one transistor module 16 is shown in the figure), and three smoothing electrolytic capacitors 17 (in the figure, common to the motor inverter and the generator inverter). , Only one smoothing electrolytic capacitor 17 is shown). A control board 19 is disposed in the control board housing chamber 18, and a control device unit (not shown) is attached to the control board 19. The transistor modules 15 and 16 are fixed to the first surface S1 of the heat sink plate 11, and the control board 19 is fixed to the second surface S2 of the heat sink plate 11.
[0015]
Each of the transistor modules 15 and 16 is composed of a pair of transistors (not shown), and three of them are connected in parallel to form a bridge circuit. Further, the smoothing electrolytic capacitor 17 smoothes a DC voltage generated in response to the supply of a DC current from a battery (not shown) to suppress fluctuations in the DC voltage.
Then, a common main circuit wiring board 36 as a first main circuit wiring section, a main circuit wiring board 37 for a motor as a second main circuit wiring section, and a third main circuit branching from each other at the branch point P1. A generator main circuit wiring board 38 as a circuit wiring portion is disposed, and each of the smoothing electrolytic capacitors 17 is connected to the main circuit wiring board 36. For this purpose, the smoothing electrolytic capacitor 17 includes a positive electrode terminal 34 and a negative electrode terminal 35 as shown in FIG. 3, and the positive electrode terminal 34 is connected to a DC input via a positive electrode side bus bar 36a of the main circuit wiring board 36. The negative terminal 35 is connected to the negative terminal 22 for DC input via the negative bus bar 36 b of the main circuit wiring board 36. The positive electrode terminal 21 and the negative electrode terminal 22 constitute a DC input terminal.
[0016]
The positive terminal 34 of the smoothing electrolytic capacitor 17 is connected to the positive terminal 15a of each transistor module 15 via the positive bus bar 36a and the positive bus bar 37a of the main circuit wiring board 37, and the negative terminal 35 is connected to the negative side. The bus bar 36 b and the negative bus bar 37 b of the main circuit wiring board 37 are connected to the negative terminal 15 b of each transistor module 15. The output terminal 15c of each transistor module 15 is connected to a motor (not shown) via output bus bars 81-83.
[0017]
Therefore, a smoothing electrolytic capacitor 17 is removed from the battery by generating a switching signal by a base drive circuit (not shown) as a driver in the controller unit, inputting the switching signal to each transistor, and switching each transistor. The direct current supplied through the transistor is converted into a phase current as an alternating current while flowing between the emitter and collector of each transistor, and the phase current is output from the output terminals 15c to the output bus bars 81 to 83. . Therefore, by driving the motor, a driving wheel (not shown) can be rotated to drive the hybrid vehicle.
[0018]
The positive electrode terminal 34 of the smoothing electrolytic capacitor 17 is connected to the positive electrode terminal 16a of each transistor module 16 via the positive electrode bus bar 36a and the positive electrode bus bar 38a of the main circuit wiring board 38, and the negative electrode terminal 35 is connected to the negative electrode The side bus bar 36 b and the negative circuit side bus bar 38 b of the main circuit wiring board 38 are connected to the negative terminal 16 b of each transistor module 16. The input terminal 16c of each transistor module 16 is connected to a generator (not shown) via input bus bars 85 and 86. Note that another input bus bar (not shown) is actually provided.
[0019]
Therefore, by generating a switching signal by the base drive circuit, inputting the switching signal to each transistor, and switching each transistor, the phase current generated by the generator is an input bus bar 85, 86 is input to each input terminal 16c via 86, converted to a direct current while flowing between the emitter and collector of each transistor, and the direct current is sent to the battery or motor inverter via each smoothing electrolytic capacitor 17. .
[0020]
By the way, a terminal assembly 41 is integrally formed at one end of a pair of lead wires (not shown) connecting the battery, the inverter for motor and the inverter for generator, and the terminal assembly 41 is formed in the through hole 112 of the inverter case 12. And is supported by the inverter case 12.
[0021]
In addition, a pair of current sensors 131 on the positive electrode side and the negative electrode side (only one current sensor 131 is shown in the figure) is provided to detect a direct current supplied from the battery. The current sensor 131 is formed of a rectangular annular block having a through hole 131a formed in the center, and is supported by a support member 132 fixed to the heat sink plate 11 at a position adjacent to the through hole 112. For this purpose, a fixing portion 132 a is formed at the upper end of the support member 132. In the inverter case 12, an input wiring board 43 including a positive bus bar 43a and a negative bus bar 43b passes between the terminal assemblies 41 and the positive terminal 21 and the negative terminal 22 through the through holes 131a. Each input wiring board 43 and each terminal assembly 41 are fixed by bolts b1, and each input wiring board 43, the positive terminal 21 and the negative terminal 22 are fixed by bolts b2. Further, a buffer member 145 made of an elastic body such as rubber, plastic or the like is fitted on the input wiring board 43 in the through-hole 131a, and presses the input wiring board 43 against the current sensor 131.
[0022]
By the way, in each bridge circuit constituting the motor inverter, six transistors are arranged to switch each transistor. When each transistor is turned off, it is connected between the collector and the emitter. Surge voltage V_SM
V_SM= L_MDI_M/ Dt + V_DC
Will occur. L_MIs the main circuit inductance between each smoothing electrolytic capacitor 17 and the motor inverter, I_MIs the current flowing between the collector and emitter of each transistor arranged in the bridge circuit of the motor inverter, V_DCIs a DC voltage supplied from the battery.
[0023]
Each bridge circuit constituting the generator inverter is provided with six transistors for switching the transistors. When the transistors are turned off, the transistors are connected between the collector and the emitter. Surge voltage V_SG
V_SG= L_GDI_G/ Dt + V_DC
Will occur. L_GIs the main circuit inductance between each smoothing electrolytic capacitor 17 and the generator inverter, I_GIs the current flowing between the collector and emitter of each transistor arranged in the bridge circuit of the generator inverter. And the surge voltage V_SM, V_SGIf they are extremely different from each other, the amount of heat generation may increase or the withstand voltage of the transistor may be exceeded, and the motor inverter and the generator inverter may malfunction or be damaged.
[0024]
Therefore, in the present embodiment, each of the smoothing electrolytic capacitors 17 is connected to a predetermined location between the positive terminal 21 and the negative terminal 22 on the main circuit wiring board 36 and the branch point P1.
Therefore, the direct current supplied from the battery to the positive terminal 21 and the negative terminal 22 is supplied to the motor inverter and the generator inverter via each smoothing electrolytic capacitor 17, or the phase current generated by the generator is supplied. When the direct current is converted into direct current by the generator inverter and the direct current is supplied to the motor inverter or the battery via each smoothing electrolytic capacitor 17, the smoothing electrolytic capacitor 17, the motor inverter, and the generator inverter Are arranged in the shortest path in the order of passage of the direct current or phase current. Therefore, the surge voltage V_SM, V_SGThe difference between them can be reduced and the withstand voltage of the transistor can be prevented from exceeding.
[0025]
By the way, the maximum DC current flowing through the transistor in the motor inverter, that is, the maximum current is expressed as I_MmaxAnd the maximum DC current flowing through the transistor in the generator inverter, that is, the maximum current is I_GmaxThen, each maximum current I_Mmax, I_GmaxBoth vary depending on the driving conditions of the motor and generator.
[0026]
Therefore, the maximum current I_Mmax, I_GmaxAre equal to each other, the wiring distance between each smoothing electrolytic capacitor 17 and each transistor module 15 is represented by LH._MAnd the wiring distance between each smoothing electrolytic capacitor 17 and each transistor module 16 is LH._GWiring distance LH_M, LH_GThe
LH_M= LH_G
The surge voltage V_SM, V_SGThe difference between them can be eliminated.
[0027]
That is, the wiring distance between the positive electrode terminal 34 of each smoothing electrolytic capacitor 17 and the positive electrode terminal 15 a of each transistor module 15, and the positive electrode terminal 34 of each smoothing electrolytic capacitor 17 and the positive electrode terminal 16 a of each transistor module 16. And the wiring distance between the negative electrode terminal 35 of each smoothing electrolytic capacitor 17 and the negative electrode terminal 15 b of each transistor module 15, the negative electrode terminal 35 of each smoothing electrolytic capacitor 17, and each The wiring distance to the negative electrode terminal 16b of the transistor module 16 is made equal.
[0028]
Therefore, the main circuit inductance L between each smoothing electrolytic capacitor 17 and the motor inverter._MAnd the main circuit inductance L between each smoothing electrolytic capacitor 17 and the generator inverter_GAre equal to each other so that each surge voltage V_SM, V_SGThe difference between them can be eliminated.
In contrast, the maximum current I_Mmax, I_GmaxAre different from each other, the differential dI_M/ Dt, dI_G/ Dt are different from each other. Therefore, the differential dI_M/ Dt, dI_GWiring distance LH by / dt different from each other_M, LH_GAre different from each other, and the main circuit inductance L_M, L_GA second embodiment of the present invention will be described that is different from each other. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol.
[0029]
FIG. 2 is a schematic diagram of an inverter device according to the second embodiment of the present invention.
In this case, the wiring distance LH between each smoothing electrolytic capacitor 17 and each transistor module 15, that is, between the points P2 and P3._MAnd a wiring distance LH between each smoothing electrolytic capacitor 17 and each transistor module 16, that is, between the points P2 and P4._GIs set differently.
[0030]
For example, the maximum current I_Mmax, I_GmaxBut,
I_Mmax> I_Gmax
The wiring distance LH_M, LH_GThe
LH_M<LH_G
The main circuit inductance L_M, L_GThe
L_M<L_G
Can be. In contrast, the maximum current I_Mmax, I_GmaxBut,
I_Mmax<I_Gmax
The wiring distance LH_M, LH_GThe
LH_M> LH_G
The main circuit inductance L_M, L_GThe
L_M> L_G
Can be.
[0031]
Therefore, each surge voltage V_SM, V_SGThe difference between them can be eliminated.
Also, the main circuit inductance L_M, L_GAre different from each other in the area where the positive side bus bars 37a, 38a and the negative side bus bars 37b, 38b overlap in the main circuit wiring boards 37, 38, that is, the overlapping area S._M, S_GCan be different from each other.
[0032]
Therefore, the differential dI_M/ Dt, dI_GOverlapping area S by / dt different from each other_M, S_GAre different from each other, and the main circuit inductance L_M, L_GA third embodiment of the present invention will be described that is different from each other. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol.
[0033]
FIG. 3 is a plan view of an inverter device according to the third embodiment of the present invention.
In this case, the overlapping area S of the positive side bus bars 37a (FIG. 1), 38a and the negative side bus bars 37b, 38b in the main circuit wiring boards 37, 38._M, S_GAre set differently from each other.
For example, the maximum current I_Mmax, I_GmaxBut,
I_Mmax> I_Gmax
The overlap area S_M, S_GThe
S_M> S_G
The main circuit inductance L_M, L_GThe
L_M<L_G
Can be. In contrast, the maximum current I_Mmax, I_GmaxBut,
I_Mmax<I_Gmax
The overlap area S_M, S_GThe
S_M<S_G
The main circuit inductance L_M, L_GThe
L_M> L_G
Can be.
[0034]
Therefore, each surge voltage V_SM, V_SGThe difference between them can be eliminated.
Thus, each surge voltage V_SM, V_SGSince the difference between the two can be eliminated, the amount of heat generation does not increase or the withstand voltage of the transistor is not exceeded, and the motor inverter and generator inverter are prevented from malfunctioning or being damaged. be able to. Therefore, the reliability of the inverter device can be improved.
[0035]
In addition, since it is not necessary to increase the capacity of the diodes, resistors, capacitors, etc. constituting the snubber circuit disposed in each bridge circuit, the bridge circuit can be simplified and the cost of the inverter device can be reduced. be able to.
By the way, the main circuit wiring boards 36 to 38 have a laminated structure in which the positive electrode side bus bars 36a to 38a and the negative electrode side bus bars 36b to 38b are overlapped. Therefore, each of the main circuit wiring boards 36 to 38 can have the same capacitance as the capacitor, so that not only the noise radiated from the main circuit wiring boards 36 to 38 can be reduced, but also from the outside. The influence of noise on the main circuit wiring boards 36 to 38 can be reduced.
[0036]
In addition, since the main circuit wiring boards 36 to 38 have a laminated structure, the main circuit inductance L_M, L_GCan be reduced. Therefore, it is possible to further prevent malfunctions of the motor inverter and the generator inverter, thereby further improving the reliability of the inverter device.
Furthermore, since the main circuit wiring boards 36 to 38 have a laminated structure, the wiring impedance can be reduced. Therefore, the ripple current flowing into and out of the smoothing electrolytic capacitor 17 can be reduced.
[0037]
Since the main circuit wiring board 36 has a laminated structure, even if the wiring distance of the wiring (not shown) connecting the battery and the positive terminal 21 and the negative terminal 22 in the inverter case 12 is relatively long, the rigidity of the wiring Can be high. Therefore, not only can the influence of vibration or the like applied to the wiring from the outside be reduced, but also a member for supporting the wiring becomes unnecessary. As a result, the inverter device can be reduced in size.
[0038]
Next, a fourth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol.
FIG. 4 is a schematic diagram of an inverter device according to the fourth embodiment of the present invention.
In this case, the common main circuit wiring board 136 as the first main circuit wiring part, the main circuit wiring board 137 for the motor as the second main circuit wiring part, and the third branching from each other at the branch point P5. A main circuit wiring board 138 for a generator as a main circuit wiring portion is provided, and each smoothing electrolytic capacitor 17 is connected to the main circuit wiring boards 136 to 138 at a branch point P5.
[0039]
For this purpose, each of the smoothing electrolytic capacitors 17 is disposed with the positive electrode terminal 34 (FIG. 3) and the negative electrode terminal 35 facing upward and through the heat sink plate 11.
In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.
[0040]
【The invention's effect】
  As described above in detail, according to the present invention, in the inverter device, the first to third main circuit wiring portions branching from each other at the branch point and the end portions of the first main circuit wiring portions are arranged. A DC input terminal for supplying a DC current from the battery and connected between the DC input terminal and the branch point in the first main circuit wiring section, and a DC current to the DC input terminal A smoothing electrolytic capacitor for smoothing a DC voltage generated with the supply, and connected to the second main circuit wiring section, for converting the DC current into an AC current and supplying the AC current to the motor A motor inverter; and a generator inverter connected to the third main circuit wiring unit for converting an alternating current from the generator into a direct current and supplying the direct current to the battery.
  And the maximum current flowing through the transistor of the motor inverter and the maximum current flowing through the transistor of the generator inverter are equal to each other, the wiring distance between the smoothing electrolytic capacitor and the motor inverter, and the smoothing electrolytic capacitor And the wiring distance between the generator inverters.
[0041]
In this case, the direct current supplied from the battery to the direct current input terminal is supplied to the motor inverter and the generator inverter via each smoothing electrolytic capacitor, or the alternating current generated by the generator is used as the generator inverter. When the direct current is converted to a direct current by the smoothing electrolytic capacitor and supplied to the motor inverter or the battery via each smoothing electrolytic capacitor, the smoothing electrolytic capacitor, the motor inverter, and the generator inverter are connected to the direct current or the alternating current. Will be arranged in the shortest path in the order of passage.
[0042]
Accordingly, the difference between the surge voltage generated in the motor inverter and the surge voltage generated in the generator inverter can be reduced, so that the amount of generated heat does not increase and the withstand voltage of the transistor is not exceeded. It is possible to prevent the inverter inverter and the generator inverter from malfunctioning or being damaged. Therefore, the reliability of the inverter device can be improved.
[0043]
In addition, since it is not necessary to increase the capacity of the diode, resistor, capacitor, etc. constituting the snubber circuit in the motor inverter and the generator inverter, the bridge circuit constituting the motor inverter and the generator inverter can be simplified. In addition to this, the cost of the inverter device can be reduced.
[0044]
  Further, the maximum current flowing through the transistor of the motor inverter and the maximum current flowing through the transistor of the generator inverter are made equal to each other, a wiring distance between the smoothing electrolytic capacitor and the motor inverter, and the smoothing electrolytic capacitor, Since the wiring distance between the generator inverter is made equal, the main circuit inductance between the smoothing electrolytic capacitor and the motor inverter, and the main circuit inductance between the smoothing electrolytic capacitor and the generator inverter Can be made equal.
  Therefore, the difference between the surge voltage generated in the motor inverter and the surge voltage generated in the generator inverter can be eliminated.
[0045]
  In still another inverter device of the present invention, the first to third main circuit wiring portions branching from each other at a branching point and the end of the first main circuit wiring portion are arranged, and the direct current from the battery And a DC voltage that is generated when a DC current is supplied to the DC input terminal connected between the DC input terminal and the branch point in the first main circuit wiring section. An electrolytic capacitor for smoothing, a motor inverter connected to the second main circuit wiring section, for converting the direct current into an alternating current and supplying the alternating current to the motor, and the third And a generator inverter for converting the alternating current from the generator into a direct current and supplying the direct current to the battery.
  And a wiring distance between the smoothing electrolytic capacitor and the motor inverter, and the smoothing electrolysis by an amount different from a maximum current flowing through the transistor of the motor inverter and a maximum current flowing through the transistor of the generator inverter. The wiring distance between the capacitor and the generator inverter is set differently.
[0046]
In this case, even if the maximum current flowing through the transistor of the motor inverter differs from the maximum current flowing through the transistor of the generator inverter, the main circuit inductance between the smoothing electrolytic capacitor and the motor inverter, and the smoothing The main circuit inductance between the electrolytic capacitor and the generator inverter can be made equal.
[0047]
  In still another inverter device of the present invention, the first to third main circuit wiring portions branching from each other at a branching point and the end of the first main circuit wiring portion are arranged, and the direct current from the battery And a DC voltage that is generated when a DC current is supplied to the DC input terminal connected between the DC input terminal and the branch point in the first main circuit wiring section. An electrolytic capacitor for smoothing, a motor inverter connected to the second main circuit wiring section, for converting the direct current into an alternating current and supplying the alternating current to the motor, and the third And a generator inverter for converting the alternating current from the generator into a direct current and supplying the direct current to the battery.
  The first to third main circuit wiring portions have a laminated structure in which a positive electrode bus bar and a negative electrode bus bar are overlapped, and the maximum current flowing through the transistor of the motor inverter and the generator inverter The overlapping area in the second main circuit wiring portion and the overlapping area in the third main circuit wiring portion are set different from each other by an amount different from the maximum current flowing through the transistor.
  In this case, since the first to third main circuit wiring portions can have the same capacitance as the capacitor, noise radiated from the first to third main circuit wiring portions can only be reduced. In addition, the influence of external noise on the first to third main circuit wiring portions can be reduced.
[0048]
In addition, since the first to third main circuit wiring portions have a laminated structure, the main circuit inductance between the smoothing electrolytic capacitor and the motor inverter, and the smoothing electrolytic capacitor and the generator inverter The main circuit inductance in between can be reduced. Therefore, it is possible to further prevent malfunctions of the motor inverter and the generator inverter, thereby further improving the reliability of the inverter device.
[0049]
Furthermore, since the first to third main circuit wiring portions have a laminated structure, the impedance of the wiring can be reduced. Therefore, the ripple current flowing into and out of the smoothing electrolytic capacitor can be reduced.
And since the said 1st main circuit wiring part is made into a laminated structure, even when the wiring distance of the wiring which connects a battery and a DC input terminal in an inverter case is comparatively long, the rigidity of wiring can be made high. it can. Therefore, not only can the influence of vibration or the like applied to the wiring from the outside be reduced, but also a member for supporting the wiring becomes unnecessary. As a result, the inverter device can be reduced in size.
[0050]
  Further, the overlapping area in the second main circuit wiring portion and the third main circuit wiring portion are equivalent to the maximum current flowing through the transistor of the motor inverter and the maximum current flowing through the transistor of the generator inverter. Therefore, even if the maximum current flowing through the transistor of the motor inverter differs from the maximum current flowing through the transistor of the generator inverter, the smoothing electrolytic capacitor and the motor inverter And the main circuit inductance between the smoothing electrolytic capacitor and the generator inverter can be made equal.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an inverter device according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram of an inverter device according to a second embodiment of the present invention.
FIG. 3 is a plan view of an inverter device according to a third embodiment of the present invention.
FIG. 4 is a schematic diagram of an inverter device according to a fourth embodiment of the present invention.
[Explanation of symbols]
17 Smoothing electrolytic capacitor
21 Positive terminal
22 Negative terminal
36-38, 136-138 Main circuit wiring board
36a-38a Positive side bus bar
36b-38b Negative side bus bar
P1, P5 branch point

Claims (5)

First to third main circuit wiring portions that are branched from each other at a branch point; a direct current input terminal that is disposed at an end of the first main circuit wiring portion and supplies a direct current from a battery; A smoothing electrolytic capacitor that is connected between the DC input terminal and the branch point in the first main circuit wiring section, and smoothes a DC voltage that is generated when a DC current is supplied to the DC input terminal; A generator connected to a second main circuit wiring unit, for converting the DC current into an AC current and supplying the AC current to the motor; and a third main circuit wiring unit, the alternating current from into a DC current, which has a generator inverter for supplying the DC current to the battery, the maximum current and the generator for in flowing through the transistor of the inverter for the motor The maximum currents flowing through the transistors of the converter are made equal to each other, and the wiring distance between the smoothing electrolytic capacitor and the motor inverter is made equal to the wiring distance between the smoothing electrolytic capacitor and the generator inverter. inverter and wherein the that. First to third main circuit wiring portions that are branched from each other at a branch point; a direct current input terminal that is disposed at an end of the first main circuit wiring portion and supplies a direct current from a battery; A smoothing electrolytic capacitor that is connected between the DC input terminal and the branch point in the first main circuit wiring section, and smoothes a DC voltage that is generated when a DC current is supplied to the DC input terminal; A generator connected to a second main circuit wiring unit, for converting the DC current into an AC current and supplying the AC current to the motor; and a third main circuit wiring unit, A generator inverter for converting the alternating current from the converter into a direct current and supplying the direct current to the battery, and the maximum current flowing through the transistor of the motor inverter and the generator input Only the maximum current is different amount from each other through the transistor over data, a wiring distance between the smoothing capacitor and the motor inverter, the wiring distance between the smoothing capacitor and the generator inverter is different An inverter device characterized by being set . If the maximum current is greater than the maximum current flowing through the transistor of inverter the motor flows through the transistors of the generator inverter, the wiring distance between the smoothing capacitor and the motor inverter is the smoothing electrolytic capacitor and the generator inverter And the maximum current flowing through the transistor of the motor inverter is smaller than the maximum current flowing through the transistor of the generator inverter, the wiring distance between the smoothing electrolytic capacitor and the motor inverter is 3. The inverter device according to claim 2 , wherein the inverter device is longer than a wiring distance between the smoothing electrolytic capacitor and the generator inverter. First to third main circuit wiring portions that are branched from each other at a branch point; a direct current input terminal that is disposed at an end of the first main circuit wiring portion and supplies a direct current from a battery; A smoothing electrolytic capacitor that is connected between the DC input terminal and the branch point in the first main circuit wiring section, and smoothes a DC voltage that is generated when a DC current is supplied to the DC input terminal; A generator connected to a second main circuit wiring unit, for converting the DC current into an AC current and supplying the AC current to the motor; and a third main circuit wiring unit, And a generator inverter for supplying the direct current to the battery, and the first to third main circuit wiring portions include a positive bus bar, a negative bus bar, Repeatedly Have a layered structure made, only the transistor maximum current is different amount from each other through the maximum current and the generator inverter flowing through the transistor of the inverter for the motor, and the overlapping area of the second main circuit wire portion, the An inverter device, wherein the overlapping area in the third main circuit wiring portion is set differently . If the maximum current is greater than the maximum current flowing through the transistor of inverter the motor flows through the transistors of the generator inverter and the second area overlapping the main circuit wire portion is larger than the overlapping area of the third main circuit wire portion When the maximum current flowing through the transistor of the motor inverter is smaller than the maximum current flowing through the transistor of the generator inverter , the overlapping area in the second main circuit wiring portion is smaller than the overlapping area in the third main circuit wiring portion. The inverter device according to claim 4.

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